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I think if a mob spawner is underground, it will stop checking for is their safe conditions after any kind of reload (/mm reload; /reload or a regular full server reload with /stop)

I was having a bug related with creating a spawner underground; mobs where getting spawned in blocks and getting suffocated. I realized that this happens if I create the spawner and then do whatever of the reloads I mention. If I create the spawner, it works just fine, but it starts spawning mobs in walls as soon I do any kind of reloads. It wasn't complicated to get the bug, so it's not hard to reproduce.

When I create the spawner, players can get near and far away and it will keep working fine; but, as I said, the spawner gets broken with reloads.

Well, of course after the reloads the spawners would have to work fine, checking safe conditions after reloads. After any of the reloads, if I remove the spawner and create a new one just like the one I deleted, again, starts working fine

I don't think its necessary a log or any of this kind of things, there was nothing wrong about MM in the console and no errors appeared. The spawner I created was a simple zombie spawner with iron armor and with these properties: radius: 40 leashrange: 0 mobsperspawn: 10 maxmobs: 40 And also I don't think these data is important neither. I've tried with several properties and the problem is pretty much the same.